Java/Swing JFC/GridBagLayout

A GridBagLayout Example: weightx, weighty

   <source lang="java">

import java.awt.Button; import java.awt.Frame; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JPanel; public class Main extends JPanel {

 protected void makebutton(String name, GridBagLayout gridbag, GridBagConstraints c) {
   Button button = new Button(name);
   gridbag.setConstraints(button, c);
   add(button);
 }
 public Main() {
   GridBagLayout gridbag = new GridBagLayout();
   GridBagConstraints c = new GridBagConstraints();
   setLayout(gridbag);
   c.weightx = 1.0;
   c.weighty = 1.0;
   makebutton("Button 1", gridbag, c);
   c.fill = GridBagConstraints.BOTH;
   makebutton("Button 2", gridbag, c);
 }
 public static void main(String args[]) {
   Frame f = new Frame();
   JPanel mgb = new Main();
   f.add("Center", mgb);
   f.pack();
   f.setSize(300, 300);
   f.setVisible(true);
 }

}

 </source>
   
  
 
  

Associate the gridbag constraints with the component

   <source lang="java">
 

import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   Container container = frame.getContentPane();
   GridBagLayout gbl = new GridBagLayout();
   container.setLayout(gbl);
   
   GridBagConstraints gbc = new GridBagConstraints();
   gbc.gridx = 1;
   gbc.gridy = 1;
   
   JButton component = new JButton("a");
   
   
   gbl.setConstraints(component, gbc);
   container.add(component);
   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Create and set a gridbag layout and how to set gridbag constraints

   <source lang="java">
 

import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   Container container = frame.getContentPane();
   GridBagLayout gbl = new GridBagLayout();
   container.setLayout(gbl);
   // Place a component at cell location (1,1)
   GridBagConstraints gbc = new GridBagConstraints();
   gbc.gridx = 1;
   gbc.gridy = 1;
   
   JButton component = new JButton("a");
   
   // Associate the gridbag constraints with the component
   gbl.setConstraints(component, gbc);
   container.add(component);
   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Getting the Number of Rows and Columns of Cells in a GridBagLayout

   <source lang="java">

import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   Container container = frame.getContentPane();
   GridBagLayout gbl = new GridBagLayout();
   container.setLayout(gbl);
   GridBagConstraints gbc = new GridBagConstraints();
   JButton component1 = new JButton("a");
   JButton component2 = new JButton("b");
   gbc.gridx = 1;
   gbc.gridy = 1;
   gbl.setConstraints(component1, gbc);
   container.add(component1);
   gbc.gridx = 0;
   gbc.gridy = 0;
   gbl.setConstraints(component2, gbc);
   container.add(component2);
   container.add(component1);
   container.add(component2);
   frame.pack();
   frame.setVisible(true);
   gbl.layoutContainer(container);
   int[][] dim = gbl.getLayoutDimensions();
   int cols = dim[0].length;
   int rows = dim[1].length;
   System.out.println(cols);
   System.out.println(rows);
 }

}

 </source>
   
  
 
  

GridBagConstraints.BOTH

   <source lang="java">
 

import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class GridBag4 extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public GridBag4() {
   setLayout(new GridBagLayout());
   constraints.fill = GridBagConstraints.BOTH;
   constraints.weighty = 1.0;
   int x, y; // for clarity
   constraints.weightx = 0.1;
   addGB(new JButton("one"), x = 0, y = 0);
   constraints.weightx = 0.5;
   addGB(new JButton("two"), ++x, y);
   constraints.weightx = 1.0;
   addGB(new JButton("three"), ++x, y);
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("GridBag4");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(300, 100);
   frame.setLocation(200, 200);
   frame.setContentPane(new GridBag4());
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

GridBagLayout Pane

   <source lang="java">
 

/*

* Copyright (c) 2000 David Flanagan. All rights reserved. This code is from the
* book Java Examples in a Nutshell, 2nd Edition. It is provided AS-IS, WITHOUT
* ANY WARRANTY either expressed or implied. You may study, use, and modify it
* for any non-commercial purpose. You may distribute it non-commercially as
* long as you retain this notice. For a commercial use license, or to purchase
* the book (recommended), visit http://www.davidflanagan.ru/javaexamples2.
*/

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class GridBagLayoutPane extends JPanel {

 public GridBagLayoutPane() {
   // Create and specify a layout manager
   this.setLayout(new GridBagLayout());
   // Create a constraints object, and specify some default values
   GridBagConstraints c = new GridBagConstraints();
   c.fill = GridBagConstraints.BOTH; // components grow in both dimensions
   c.insets = new Insets(5, 5, 5, 5); // 5-pixel margins on all sides
   // Create and add a bunch of buttons, specifying different grid
   // position, and size for each.
   // Give the first button a resize weight of 1.0 and all others
   // a weight of 0.0. The first button will get all extra space.
   c.gridx = 0;
   c.gridy = 0;
   c.gridwidth = 4;
   c.gridheight = 4;
   c.weightx = c.weighty = 1.0;
   this.add(new JButton("Button #1"), c);
   c.gridx = 4;
   c.gridy = 0;
   c.gridwidth = 1;
   c.gridheight = 1;
   c.weightx = c.weighty = 0.0;
   this.add(new JButton("Button #2"), c);
   c.gridx = 4;
   c.gridy = 1;
   c.gridwidth = 1;
   c.gridheight = 1;
   this.add(new JButton("Button #3"), c);
   c.gridx = 4;
   c.gridy = 2;
   c.gridwidth = 1;
   c.gridheight = 2;
   this.add(new JButton("Button #4"), c);
   c.gridx = 0;
   c.gridy = 4;
   c.gridwidth = 1;
   c.gridheight = 1;
   this.add(new JButton("Button #5"), c);
   c.gridx = 2;
   c.gridy = 4;
   c.gridwidth = 1;
   c.gridheight = 1;
   this.add(new JButton("Button #6"), c);
   c.gridx = 3;
   c.gridy = 4;
   c.gridwidth = 2;
   c.gridheight = 1;
   this.add(new JButton("Button #7"), c);
   c.gridx = 1;
   c.gridy = 5;
   c.gridwidth = 1;
   c.gridheight = 1;
   this.add(new JButton("Button #8"), c);
   c.gridx = 3;
   c.gridy = 5;
   c.gridwidth = 1;
   c.gridheight = 1;
   this.add(new JButton("Button #9"), c);
 }
 public static void main(String[] a) {
   JFrame f = new JFrame();
   f.addWindowListener(new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
       System.exit(0);
     }
   });
   f.setContentPane(new GridBagLayoutPane());
   f.pack();
   f.setVisible(true);
 }

}

 </source>
   
  
 
  

GridBagLayout with anchor constraints

   <source lang="java">
 

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class GridBagWithAnchor {

 public static void main(String[] args) {
   JFrame f = new JFrame(
       "Demonstrates the use of anchor constraints");
   JPanel p = new JPanel(new GridBagLayout());
   p.setLayout(new GridBagLayout());
   GridBagConstraints c = new GridBagConstraints();
   c.insets = new Insets(2, 2, 2, 2);
   c.weighty = 1.0;
   c.weightx = 1.0;
   c.gridx = 0;
   c.gridy = 0;
   c.gridheight = 2;
   c.anchor = GridBagConstraints.NORTH; // place component on the North
   p.add(new JButton("Java"), c);
   c.gridx = 1;
   c.gridheight = 1;
   c.gridwidth = 2;
   c.anchor = GridBagConstraints.SOUTHWEST;
   p.add(new JButton("Source"), c);
   c.gridy = 1;
   c.gridwidth = 1;
   c.anchor = GridBagConstraints.CENTER; // remember to rest to center
   p.add(new JButton("and"), c);
   c.gridx = 2;
   p.add(new JButton("Support !!!"), c);
   WindowListener wndCloser = new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
       System.exit(0);
     }
   };
   f.addWindowListener(wndCloser);
   f.getContentPane().add(p);
   f.setSize(600, 200);
   f.show();
 }

}

 </source>
   
  
 
  

GridBagLayout with constraints

   <source lang="java">
 

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class GridBagWithContaints {

 public static void main(String[] args) {
   JFrame f = new JFrame(
       "Demonstrates the use of gridx, gridy,ipadx, ipady and insets constraints");
   JPanel p = new JPanel();
   p.setLayout(new GridBagLayout());
   // creates a constraints object
   GridBagConstraints c = new GridBagConstraints();
   c.insets = new Insets(2, 2, 2, 2); // insets for all components
   c.gridx = 0; // column 0
   c.gridy = 0; // row 0
   c.ipadx = 5; // increases components width by 10 pixels
   c.ipady = 5; // increases components height by 10 pixels
   p.add(new JButton("Java"), c); // constraints passed in
   c.gridx = 1; // column 1
   // c.gridy = 0; // comment out this for reusing the obj
   c.ipadx = 0; // resets the pad to 0
   c.ipady = 0;
   p.add(new JButton("Source"), c);
   c.gridx = 0; // column 0
   c.gridy = 1; // row 1
   p.add(new JButton("and"), c);
   c.gridx = 1; // column 1
   p.add(new JButton("Support."), c);
   WindowListener wndCloser = new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
       System.exit(0);
     }
   };
   f.addWindowListener(wndCloser);
   f.getContentPane().add(p);
   f.setSize(600, 200);
   f.show();
 }

}

 </source>
   
  
 
  

GridBagLayout with gridwidth and gridheight constraints

   <source lang="java">
 

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class GridBagWithGridWidthHeight {

 public static void main(String[] args) {
   JFrame f = new JFrame(
       "Demonstrates the use of gridwidth, gridheight constraints");
   JPanel p = new JPanel(new GridBagLayout());
   GridBagConstraints c = new GridBagConstraints();
   c.insets = new Insets(2, 2, 2, 2);
   c.weighty = 1.0;
   c.weightx = 1.0;
   c.gridx = 0;
   c.gridy = 0;
   c.gridheight = 2; // span across 2 rows
   p.add(new JButton("Java"), c);
   c.gridx = 1;
   c.gridheight = 1; // set back to 1 row
   c.gridwidth = 2; // span across 2 columns
   p.add(new JButton("Source"), c);
   c.gridy = 1;
   c.gridwidth = 1; // set back to 1 column
   p.add(new JButton("and"), c);
   c.gridx = 2;
   p.add(new JButton("Support."), c);
   WindowListener wndCloser = new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
       System.exit(0);
     }
   };
   f.addWindowListener(wndCloser);
   f.getContentPane().add(p);
   f.setSize(600, 200);
   f.show();
 }

}

 </source>
   
  
 
  

GridBagLayout with weight constraint

   <source lang="java">
 

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class GridBagWithWeight {

 public static void main(String[] args) {
   JFrame f = new JFrame(
       "Demonstrates the use of fill constraints");
   JPanel p = new JPanel(new GridBagLayout());
   GridBagConstraints c = new GridBagConstraints();
   c.insets = new Insets(2, 2, 2, 2);
   c.weighty = 1.0;
   c.weightx = 1.0;
   c.gridx = 0;
   c.gridy = 0;
   c.gridheight = 2;
   c.fill = GridBagConstraints.BOTH; // Use both horizontal & vertical
   p.add(new JButton("Java"), c);
   c.gridx = 1;
   c.gridheight = 1;
   c.gridwidth = 2;
   c.fill = GridBagConstraints.HORIZONTAL; // Horizontal only
   p.add(new JButton("Source"), c);
   c.gridy = 1;
   c.gridwidth = 1;
   c.fill = GridBagConstraints.NONE; // Remember to reset to none
   p.add(new JButton("and"), c);
   c.gridx = 2;
   c.fill = GridBagConstraints.VERTICAL; // Vertical only
   p.add(new JButton("Support."), c);
   WindowListener wndCloser = new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
       System.exit(0);
     }
   };
   f.addWindowListener(wndCloser);
   f.getContentPane().add(p);
   f.setSize(600, 200);
   f.show();
 }

}

 </source>
   
  
 
  

GridBagLayout with weightx and weighty constraints

   <source lang="java">
 

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class GridBagWithWeight {

 public static void main(String[] args) {
   JFrame f = new JFrame(
       "Demonstrates the use of weightx, weighty constraints");
   JPanel p = new JPanel();
   p.setLayout(new GridBagLayout());
   GridBagConstraints c = new GridBagConstraints();
   p.setLayout(new GridBagLayout());
   c = new GridBagConstraints();
   c.insets = new Insets(2, 2, 2, 2);
   c.weighty = 1.0;
   c.weightx = 1.0;
   c.gridx = 0;
   c.gridy = 0;
   p.add(new JButton("Java"), c);
   c.gridx = 1;
   p.add(new JButton("Source"), c);
   c.gridx = 0;
   c.gridy = 1;
   p.add(new JButton("and"), c);
   c.gridx = 1;
   p.add(new JButton("Support."), c);
   WindowListener wndCloser = new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
       System.exit(0);
     }
   };
   f.addWindowListener(wndCloser);
   f.getContentPane().add(p);
   f.setSize(600, 200);
   f.show();
 }

}

 </source>
   
  
 
  

Make the component only stretch horizontally

   <source lang="java">

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   GridBagLayout gbl = new GridBagLayout();
   frame.setLayout(gbl);
   JButton component = new JButton("1");
   frame.add(component);
   frame.add(new JButton("2"));
   gbl.layoutContainer(frame);
   GridBagConstraints gbc = new GridBagConstraints();
   gbc.fill = GridBagConstraints.HORIZONTAL;
   gbl.setConstraints(component, gbc);
   frame.add(component);
   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Make the component only stretch vertically

   <source lang="java">

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   GridBagLayout gbl = new GridBagLayout();
   frame.setLayout(gbl);
   JButton component = new JButton("1");
   frame.add(component);
   frame.add(new JButton("2"));
   gbl.layoutContainer(frame);
   GridBagConstraints gbc = new GridBagConstraints();
   gbc.fill = GridBagConstraints.VERTICAL;
   gbl.setConstraints(component, gbc);
   frame.add(component);
   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Make the component on stretchable

   <source lang="java">

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   GridBagLayout gbl = new GridBagLayout();
   frame.setLayout(gbl);
   JButton component = new JButton("1");
   frame.add(component);
   frame.add(new JButton("2"));
   gbl.layoutContainer(frame);
   
   GridBagConstraints gbc = new GridBagConstraints();
   
   
   gbc.fill = GridBagConstraints.NONE;
   
   gbl.setConstraints(component, gbc);
   frame.add(component);
   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Make the component stretch in both directions

   <source lang="java">

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   GridBagLayout gbl = new GridBagLayout();
   frame.setLayout(gbl);
   JButton component = new JButton("1");
   frame.add(component);
   frame.add(new JButton("2"));
   gbl.layoutContainer(frame);
   GridBagConstraints gbc = new GridBagConstraints();
   gbc.fill = GridBagConstraints.BOTH;
   gbl.setConstraints(component, gbc);
   frame.add(component);
   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Making a GridBagLayout Fill the Container

   <source lang="java">

import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   GridBagLayout gbl = new GridBagLayout();
   frame.setLayout(gbl);
   frame.add(new JButton("1"));
   frame.add(new JButton("2"));
   gbl.layoutContainer(frame);
   double[][] weights = gbl.getLayoutWeights();
   for (int i = 0; i < 2; i++) {
     for (int j = 0; j < weights[i].length; j++) {
       weights[i][j] = 1;
     }
   }
   gbl.columnWeights = weights[0];
   gbl.rowWeights = weights[1];
   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Place a component at (0,1) with a column weight 1 and a row weight of 2

   <source lang="java">

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   GridBagLayout gbl = new GridBagLayout();
   frame.setLayout(gbl);
   JButton component = new JButton("1");
   frame.add(component);
   frame.add(new JButton("2"));
   gbl.layoutContainer(frame);
   
   GridBagConstraints gbc = new GridBagConstraints();
   gbc.gridx = 0;
   gbc.gridy = 1;
   gbc.weightx = 1;
   gbc.weighty = 2;
   gbl.setConstraints(component, gbc);

   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Place a component at cell location (1,1)

   <source lang="java">

import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   Container container = frame.getContentPane();
   GridBagLayout gbl = new GridBagLayout();
   container.setLayout(gbl);
   
   GridBagConstraints gbc = new GridBagConstraints();
   gbc.gridx = 1;
   gbc.gridy = 1;
   
   JButton component = new JButton("a");
   
   
   gbl.setConstraints(component, gbc);
   container.add(component);
   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Positioning a component in the center of other component using GridbagLayout

   <source lang="java">

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Label; import javax.swing.JFrame; import javax.swing.JPanel; public class Main {

 public static void main(String[] argv) {
   JFrame demo = new JFrame("GridBag demo, to center a component");
   JPanel parentPanel = new JPanel();
   GridBagLayout gridbag = new GridBagLayout();
   GridBagConstraints constraints = new GridBagConstraints();
   constraints.fill = GridBagConstraints.CENTER;
   gridbag.setConstraints(parentPanel, constraints);
   parentPanel.setLayout(gridbag);
   Label centerLabel = new Label(" AAA...");
   parentPanel.add(centerLabel);
   demo.add(parentPanel);
   demo.setSize(500, 500);
   demo.setVisible(true);
 }

}

 </source>
   
  
 
  

Setting Stretchyness of a GridBagLayout Using Fill

   <source lang="java">

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   GridBagLayout gbl = new GridBagLayout();
   frame.setLayout(gbl);
   JButton component = new JButton("1");
   frame.add(component);
   frame.add(new JButton("2"));
   gbl.layoutContainer(frame);
   
   GridBagConstraints gbc = new GridBagConstraints();
   
   // Make the component on stretchable
   gbc.fill = GridBagConstraints.NONE;
   
   gbl.setConstraints(component, gbc);
   frame.add(component);
   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Setting the Location of a Component in a GridBagLayout

   <source lang="java">

import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   Container container = frame.getContentPane();
   GridBagLayout gbl = new GridBagLayout();
   container.setLayout(gbl);
   GridBagConstraints gbc = new GridBagConstraints();
   JButton component1 = new JButton("a");
   JButton component2 = new JButton("b");
   gbc.gridx = 1;
   gbc.gridy = 1;
   gbl.setConstraints(component1, gbc);
   container.add(component1);
   gbc.gridx = 0;
   gbc.gridy = 0;
   gbl.setConstraints(component2, gbc);
   container.add(component2);
   container.add(component1);
   container.add(component2);
   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Setting the Space around a Component Within the Cell of the GridBagLayout Using Insets

   <source lang="java">

import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   GridBagLayout gbl = new GridBagLayout();
   frame.setLayout(gbl);
   JButton component = new JButton("1");
   frame.add(new JButton("2"));
   frame.add(new JButton("3"));
   frame.add(new JButton("4"));
   frame.add(new JButton("5"));
   frame.add(component);
   frame.add(new JButton("6"));
   frame.add(new JButton("7"));
   frame.add(new JButton("8"));
   frame.add(new JButton("9"));
   frame.add(new JButton("0"));
   
   gbl.layoutContainer(frame);
   GridBagConstraints gbc = new GridBagConstraints();
   int top = 20;
   int left = 20;
   int bottom = 2;
   int right = 40;
   gbc.insets = new Insets(top, left, bottom, right);
   gbl.setConstraints(component, gbc);

   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Setting the Stretchyness of Rows and Columns in a GridBagLayout Using Layout Weights

   <source lang="java">

import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; public class Main {

 public static void main(String[] argv) throws Exception {
   JFrame frame = new JFrame();
   GridBagLayout gbl = new GridBagLayout();
   frame.setLayout(gbl);
   frame.add(new JButton("1"));
   frame.add(new JButton("2"));
   gbl.layoutContainer(frame);

   gbl.columnWeights = new double[]{0.0f, 1.0f, 2.0f};
   gbl.rowWeights = new double[]{0.0f, 1.0f};
   frame.pack();
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Simplest gridbag layout

   <source lang="java">
 

import java.awt.GridBagLayout; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class SimpleGridBag {

 public static void main(String[] args) {
   JFrame f = new JFrame();
   JPanel p = new JPanel();
   p.setLayout(new GridBagLayout());
   p.add(new JButton("Java"));
   p.add(new JButton("Source"));
   p.add(new JButton("and"));
   p.add(new JButton("Support."));
   WindowListener wndCloser = new WindowAdapter() {
     public void windowClosing(WindowEvent e) {
       System.exit(0);
     }
   };
   f.addWindowListener(wndCloser);
   f.getContentPane().add(p);
   f.setSize(600, 200);
   f.show();
 }

}

 </source>
   
  
 
  

Work GridBagConstraints 3

   <source lang="java">
 

import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class GridBag3 extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public GridBag3() {
   setLayout(new GridBagLayout());
   constraints.weightx = 1.0;
   constraints.weighty = 1.0;
   constraints.fill = GridBagConstraints.BOTH;
   int x, y;
   constraints.gridheight = 2; // span two rows
   addGB(new JButton("one"), x = 0, y = 0);
   constraints.gridheight = 1; // set it back
   addGB(new JButton("two"), x = 1, y = 0);
   addGB(new JButton("three"), x = 2, y = 0);
   constraints.gridwidth = 2; // span two columns
   addGB(new JButton("four"), x = 1, y = 1);
   constraints.gridwidth = 1; // set it back
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("GridBag3");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(200, 200);
   frame.setLocation(200, 200);
   frame.setContentPane(new GridBag3());
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Work with GridBagConstraints 1

   <source lang="java">
 

import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class GridBag1 extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public GridBag1() {
   setLayout(new GridBagLayout());
   int x, y; // for clarity
   addGB(new JButton("North"), x = 1, y = 0);
   addGB(new JButton("West"), x = 0, y = 1);
   addGB(new JButton("Center"), x = 1, y = 1);
   addGB(new JButton("East"), x = 2, y = 1);
   addGB(new JButton("South"), x = 1, y = 2);
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("GridBag1");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(225, 150);
   frame.setLocation(200, 200);
   frame.setContentPane(new GridBag1());
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Work with GridBagConstraints 2

   <source lang="java">
 

import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class GridBag2 extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public GridBag2() {
   setLayout(new GridBagLayout());
   constraints.weightx = 1.0;
   constraints.weighty = 1.0;
   constraints.fill = GridBagConstraints.BOTH;
   int x, y; // for clarity
   addGB(new JButton("North"), x = 1, y = 0);
   addGB(new JButton("West"), x = 0, y = 1);
   addGB(new JButton("Center"), x = 1, y = 1);
   addGB(new JButton("East"), x = 2, y = 1);
   addGB(new JButton("South"), x = 1, y = 2);
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("GridBag2");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(225, 150);
   frame.setLocation(200, 200);
   frame.setContentPane(new GridBag2());
   frame.setVisible(true);
 }

}

 </source>
   
  
 
  

Work with GridBagConstraints 5

   <source lang="java">
 

import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class GridBag5 extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public GridBag5() {
   setLayout(new GridBagLayout());
   int x, y; // for clarity
   addGB(new JButton("North"), x = 1, y = 0);
   constraints.ipadx = 25; // add padding
   constraints.ipady = 25;
   addGB(new JButton("West"), x = 0, y = 1);
   constraints.ipadx = 0; // remove padding
   constraints.ipady = 0;
   addGB(new JButton("Center"), x = 1, y = 1);
   addGB(new JButton("East"), x = 2, y = 1);
   addGB(new JButton("South"), x = 1, y = 2);
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("GridBag5");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(250, 250);
   frame.setLocation(200, 200);
   frame.setContentPane(new GridBag5());
   frame.setVisible(true);
 }

}

 </source>